US399295A - Robert g - Google Patents

Description

(No Model.)

R. 0. TOTTEN.

ROLL AND' PINION.

No. 399.295. .PatentedMa'r. 12. 1889.

w n I Fzf 5 greatei Satisfaction in other ways.

U ITED STATES PATENT 'OFFICE ROBERT TOTTEN, OF ALLEGHENY, PENNSYLVANLL' noLL AND PIN IO.N.

SPECIFICATION forming part of Letters Patent No. 399,295, dated March 12, 1889.

Application filed January ll, 1889. Serial No. ?98,096. (No model.)

Tll whom it may concern:

' Be it known that I, ROBERT C, TOTTEN,

i steel body and having athin shell or facing resident of Allegheny, in the county of Allegheny and State of Pennsylvauia, have in 5 Vented a new and useful In provement in Rolls and Pinions; and I do hereby declare the followin g to be a full, clear, and exact description tions is obtained, and one which is not liable thereof.

My invention relates to the rolls and pini ionsem'ployed in rolling-mills for the rolling of iron, steel, or other metals. The strongest form of rolls and pinions heretofore manu-' factured have been composed of steel, a" low grade of Bessener or open-hearth steel being strains than the ordinary'cast-iron rolls which enployed for the" purpose, and it being found. that such steel I 'OllS Will Withstand heavier j strong steel body all the advantages obtaned 'were previously and are' still to agreat extent employed, and the steel rolls giving` A serious diificulty in the forming of such 'olls and pinions has been found, however, in that there was liability of the necks or j ournals of these rolls being porousthat is, having blow holes or cells therein either in the face of the casting when' coming from the mold or discovered by the turning of of such face in t-U--g To these ends n y invention consists, generally stated, in a roll or pinion formed of a to collectthe dirt or scale and cut out the journal, nor to'heat up rapidly during the operation of the rolls.

It also consists inconbining with such roll having a steel body and a chilled cast-ironshell or face on thenecks or journals a chilled cast-iron shell or facing upon the workingsurface of the "roll, so conbining with the in the solid chillcd-iron roll.

To enable others skilled in the art to make and use my invention, I will describe the same more fully, referring to the aeconpanying drawings, in which- Figure l is a longitudinal section of a pinion enbodying ny invention. Fig. '2 is a like View of a roll containing the same. Fg. 3 is i a like View of a roll having the chilled eastiron shell or facing upon the nccksor jouring the journals and though in making such i nals and workin -surface of the roll, and Fig.

castings attempts have been .made to overof the metal above it, this difficulty has not been overcome. hen such cells or nper';

fections cxistin the. neeks or journals of the A for'med of a low or soft grade of steel-such 45 journals, and therefore to the loss of considg erable time in the working of the roll.

The object of my invention is to provide a roll orpinion in 'which these difficulties are overcome, and in which amore perfect journal-face`practically 'free fron such impcrfec- 'tions and one which is not so liable to heat v up can be obtained. g y

4 is a longitudinal section of a nold suitable come these bythe employnent of along sinkerfor carrying out'ny invention. head, so as to compact the cast by the weight Like letters of reference indicatelike parts in each.

As shown in said several figures, the body or main portion a of therolls or pinions'is as Bessemer and open hearth--in order to obtain all the desired tensile or transverse strength to' sustain the' strains to which it may be subjected, and I include under the term `steel a steel or iron as low'or free from carbon as can be properly nelted and cast within a nold. Upon the necks or journals b of the roll or pinion I f'orn the shell 01' facing c, which is eomposed of chilled eastiron, such thin shellsor facing being united to the steel body by fusion in such way as to forni practically one casting. -On the working surface of the roll, as shown in. Fig. 3, is a like shell or faci-ng, d; of chilled cast-iron, united tothefbody of the roll in the same nanner, so that in such roll the body portion a, including the necks or jonrnals b and wab- IOO hlers or connecting portions e, are forned of steel, while the shells or facings c upon the neeks and the shell or facing upon the working-face are tormed of ehilled eastriron. The shells or fari'gs upon the necks or journals need not bo 'fo'rned ioro than about-threefourths of an ineh in thiekness, as after they are once turned and trued there is praeti'cally no appreeiable wear thereon, and the shell or facing d on the body of the roll is preferabl-y made from' three-fourths to one and one-half e ineh. in thickness to provide for the turning rfaeing of the working portion of the roll when necessary` I J In forming my improved roll or pinion'I employ a mold of suitable Construction, that shown in the drawings being such mold as is required for the fornation of a roll having both' facings of chilled cast-iron on the necks and the working portion .of-.a rol l, and the mold having the ehillf, for forming the necks or journals, and the chili g, for 'forning the working-face d, the mold having the ordinary pouringate h communieating-with the moldcavit-y, preferably below the lower mold-ehill, f, and having also the sinker-head k-and a gutter or second gate, Z, leading therefrotn, through which any extra metal can escape.

- In casting the roll I take 'a suitable mixture of cast-iron, which will chili properly when incontact with the mold-chills, and I melt a suicient quantity thereof either to fill or to partially fill the mold, and I also -1nelt ready for-castin a proper portion' of low-grade steelesuch as Bes'semer or openhearth steel. The cast-iron is first poured;

into the n old,preferably through the pouring-gate h, and in 'passing down into the mold enters' at the base thereof and rises within the nold, either filling or partiallyefilling' the same,'and when it comes in 'Contact with the several surfa'ces of the mold-chills it I chills or oongeals quickly, forning the ehilled oast iron, will force out the cast-iron which has -"place-within the mold-cavity., The steel in this filling the nold while in a molten'condition unites' with the cast-iron which has been prevu'sly filled the wabbler and 'take *its body and a 'thin shell or facing of chilled?" chilled by the nold -chill of the mold, the union'loeing formed by the fusion of the surfaces of the metals and a 'perfect union which it is practically inpossible to separate, even by crushing, being, obtained. v

In forming pinions or rolls which have not the chilled cast-iron shell or facing on the` working-portion thereof the mold employed is praetieally the same, eXcepttha-t the mold I for forming the working-face or pinion-face of the roll or pinion is composed of sandor other suitable material, instead of 'the cast- 4 iron mold-chill, and the operation of casting them is practically the same.

The mo'ld' 'is thus fornedof the main or bodyportion a, the journals b, and the wabe blers or'connecting portions e, com posed of a low grade of ste'el, and the chilled east-iron shells or faeings' cupon the neeks or journals;

and the like shell or facin g d upon the work- *ing-surface 'of the roll, united to the steel body thereof by fusion. Thechilling'of the such'manner that the form ation ofblow-holes, cells, or like impejrfections 'is practically impossible, and a solid practi'cally-perfeet-surface for the journals and working-surface is obtained, and when suehchilled cast-iron shells or surfaces are turned and trued practi- 'cally solid and perfect surfaee's forth'e jour-- nal's and working portion .of the 'roll are obsaid shells or faeingsc'd compacts them in t'ained, thus overconing the principal objece tion'to the ordinary steelroll-or pinion.

i The ehilled cast-iron shells or facin'gs on the ncks or journals, forn'ed as above deseri bed, have the further advantage that as a more compact and solid metal isemployed for such facings they are not nearly so liable to heat up under the heavy strain brought upon them during the rolling operation "and therefore run more easily 'and require less' power to operate r 'What I ela'inas ny i'nvetion, and desirc to. secure by Letters Patent, is-

1. .A roll or' pinion forrollingnetals, havingasteelbody and'a thin shell 'orfaeing of ehilled ast-iron upon tho-ueoks or journals of the roll, substantially as and for the pur poses set forth.

2. A rollforrolling meta-is, having a steel east-,iron upon-the 'neeks or journals, and

i upon the working-surface of the roll, substanv tially as and for the purposes set forth.

Intestimony whereof I, the said ROBERT C. TOTTEN, have hereunto set my hand.` T

ROBERT C. TOTTEN. lvitnessesz 4 .I. N. CO'OKE, ROBT. D. TOTTEN..

ICC

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